WEBINAR:On-demand webcast

"According to Piech, JRuby is important to the Ruby world as a
high-performance implementation of Ruby. He added that it's the
only Ruby implementation that takes advantage of true concurrency.
JRuby leverages the Java Virtual Machine's (JVM) threading
capabilities to offer concurrency.

"Piech explained that JRuby is a bridge that will help
accelerate the adoption of Ruby by the more traditional mainstream
enterprise software community rooted in Java. The Engine Yard cloud
will be using the JRuby 1.6 code branch, which debuted earlier this
year."